I think we've seen this before, in passing, but I took it apart and cleaned it of a lifetime's kitchen grime, a while ago and seem to have taken far too many photographs, which need to be out of Picasa and on the Wibbly Wobbly Way!
Obviously you need a kettle with the right kind/diameter of spout, and when the water starts to boil, the inner sliding component moves and the bird starts whistling! Before modern automatic cut-offs (which work the same way - pressure, try getting one to work if you haven't closed the lid properly, it'll boil dry!), this was an ingenious solution, to a minor problem!
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